On the use of the GP-NARX model for predicting hysteresis effects of bolted joint structures

Autor(es)

Teloli, Rafael de Oliveira ; Villani, Luis G. G. ; da Silva, Samuel ; Todd, Michael D.

• Tipo de documento: Artigo Científico
• Fonte: MECHANICAL SYSTEMS AND SIGNAL PROCESSING; v. 159, p. 20-pg., 2021-03-19.

Resumo

Structures joined by lap-joints can present complex nonlinear dynamic behavior as a function of the stress to which the lap-joint is subjected, including contact stiffness variations and softening, along with hysteresis effects related to frictional dissipation at the contact interface. Considering applications where the use of non-parametric models that depend only on input and output data is required, this work proposes and details the GP-NARX model?s use to approximate systems? dynamics with hysteresis. Initially, the proposed model?s predictive applicability is evaluated on a numerical application involving the Bouc-Wen oscillator with hysteretic damping. Then, this work proposes a GP-NARX model to describe the dynamics of the BERT benchmark, an experimental system that contains a symmetric double bolted joint that is nonlinearly dependent upon the applied excitation amplitudes, presenting as a friction joint?s well-known softening effect. The structure also presents data variation related to the presence of uncertainties in the measurement process. Thus, to accommodate the experimental variability, the training step of the GP-NARX model considers several experimental realizations. The results indicate that GP-NARX can make accurate predictions of the response of both investigated applications, emphasizing its practical ability, where the confidence intervals of the proposed model were able to accommodate the noisy experimental data, learning the nonlinear relation between the input and output data points. ? 2021 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 19/19684-3 - Detecção e quantificação de danos em estruturas com juntas parafusadas
• Beneficiário: Samuel da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/21973-5 - Novas contribuições na análise e identificação de sistemas mecânicos com histerese: aplicações no oscilador de Bouc-Wen
• Beneficiário: Rafael de Oliveira Teloli
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 15/25676-2 - Detecção robusta de danos em sistemas não lineares incertos
• Beneficiário: Luis Gustavo Giacon Villani
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 17/24977-4 - Detecção experimental de danos não lineares em sistemas não lineares incertos
• Beneficiário: Luis Gustavo Giacon Villani
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto